(2000). Percentage of Students Enrolled in Distance Education Courses: 1995. U.S. Department of Education.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Percentage of Students Enrolled in Distance Education Courses: 1995. U.S. Department of Education, 2000.
MLA -ийн эшлэл (9 дэх хэвлэлт)Percentage of Students Enrolled in Distance Education Courses: 1995. U.S. Department of Education, 2000.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.